You have visibly a fundamental misunderstanding about mining blocks.
If you have hash power that is so that, with a given difficulty, on average, you find a good block, say, every hour, which means that you have about 1/6 of the total hash power *when the difficulty was determined*, then it doesn't matter whether others are mining or not, you will win, on average, one block every hour - minus those few seconds that you were mining on the wrong block each time.
your not getting it at all!!
Really, you are mistaken on how mining works. No point in discussing further until this is cleared out.
For a given difficulty level, mining is a Poisson process with an average probability to win a block in a given time window dT, which equals
dT / 10 minutes * (your hash rate / hash rate corresponding to the difficulty level)
The rate of winning blocks is independent of others winning blocks as long as the same difficulty level is maintained.
But all this has nothing to do with your claim that full nodes can enforce a protocol (or a protocol chain) on the set of miners if these are agreeing amongst themselves on a different protocol and do not fork off.