The Battle Hackers failure largely killed the Machine Robo line in Japan. 1988 saw the release of the Winner Robo (featured in the anime), smaller figures with spring-activated transformations. The RoboShooter Gaiden playset and Thunderer mailaway toy were issued to tie in with the figures but sales were no better and the range ended after eight Winner Robo were issued. A ninth - 4WD Winner - was shown in catalogues but not released. Robo Machine soon followed into cancellation after the release of Fossilsaurus, a Rock Lords combiner imported from Battle Hackers.
Over the next 15 years there would be sporadic revivals in Japan and Europe. The first to reach toy stores were the 1993 CG Robo. These new designs featured electronic light and sound (the 'CG' stood for 'Change and Glow'), but were only supported by a CGI commercial. The range ended after 14 figures, the first five of which were exported to Europe.
There they became the core of the Robo Machines line, backed up by reissues of 1980s vintage figures. Trademark issues saw these released with pre-Tonka designations rather than names and the line was not a great success. Curiously around this time and in a largely unrelated move Entertainment in Video reissued Gobots - Battle of the Rock Lords on VHS, to date the most recent official release of anything Gobots related in Europe.
In 2001 PLEX, the Bandai design studio responsible for the CG Robo, released a set of six new Machine Robo designs - rough updates of some of the original early 1980s toys - as Gashapon toys. In 2003 they would make a more substantial contribution, overseeing the line's first TV series since 1987. Machine Robo Rescue featured some mecha influenced by the original line in a new setting as emergency services for the titular organisation. Mixing CGI and cel animation, the series was aimed at younger viewers and supported by new toys (some of which still featured diecast parts).
Despite MRR being a success, Bandai changed tack again with the brand in 2004, devising the Mugenbine system. This eschewed traditional shape-shifting robots in favour of flexible core figures with add-on parts that could make a wide variety of alternate modes and combinations. While each set had official configurations, children were encouraged to make their own combinations between multiple sets, effectively blending transforming robots with construction toys. Despite having no media support beyond commercials Machine Robo Mugenbine was a runaway success; it's still running today and has now been on the shelves for more years than the original Machine Robo line.
More traditional Gobots/Machine Robo revisitations have ironically come via the former rival Transformers franchise. Tonka folded in 1991 and Hasbro bought out their remaining assets. This included all the trademarks for the Gobots line (part of the reason behind the bland names of the 1993 Robo Machines figure ) but not the vast majority of the moulds, which were only leased out by Bandai. Since then there have been occasional references to the line, ranging from simple trademark reuses (Transformers Armada featured a supporting character named Leader-1), appearances in little-read fan comics (where the Challenge of the Gobots universe is portrayed as a collapsing alternate dimension) and outright homages in the toyline (most notably Fracture, a 2008 toy intentionally based on the Renegade Crasher). Most recently, 2012 saw Warner's burn-to-demand DVD program reissue the first Challenge of the Gobots mini-series after various rights issues were sorted, with the rest of the cartoon set to follow.