Glu's library is absolutely huge, and I think not utilizing that in this age of the Mobile Market is quite negligent. There are literally hundreds upon thousands of apps being released frequently, all of which can net profits for doing barely any work.
There's even an Online petition to get Gun Bros back on the App Store...
Fun fact : Gun Bros 1, Gun Bros 2 and Eternity Warriors 1 online servers shut down on March 23rd 2022. How do I know that? There was a fair share of Online players around February (and of course, me and my Gun Bros Discord community took part in it too). The fact that over decade old games are still being played has to account for something.
We don't even yearn for updates anymore, the only thing we want is OS compatibility and Online servers. Come on, Glu forgot to shut down their Online servers up until now, would it be really that hard to see old titles returning?