To be clear, when I said supporting, I meant providing development support, not actively peddling.  For instance, in the already discussed incredibly hypothetical scenario, 75% of new blocks would already be on a chain where some blocks are >1MB and a group of core developers refuses to adapt core to accept that chain as valid.  So, at that point the options for a developer who does want to continue supporting that chain and doesn't see a problem with 2MB blocks (since that is what this thread is predicated on, regardless of what any wallet may support) are to try to improve the most popular client on the larger chain (I would predict this to be your decision based on the post I quoted in my previous post), stick with core (presumably this requires the belief that the longer 75% chain can and will fail without turning off most users), or walk away completely (this seems like an unlikely choice, but it is still certainly an option).  That having been said, I failed to acknowledge the possibility of developing for multiple clients at once (sticking with core, but contributing to other projects as well).  Moreover, I can understand why you might not want to answer the question in its hypothetical state with so many people potentially ready to misquote such an answer (or otherwise use it against you), so I will pretend you are undecided for now unless you actually feel so strongly about this that you want to post that you would stick with contributing to core and core alone in said scenario.