Tbh providing "free" Bitcoin to subsequent blocks doesn't play out if some major entity will only mine if it's profitable, since a reorg of the original transaction will also give them fees of the subsequent ones. In fact, it gives even a stronger incentive to try a reorg and suck up all the high fees.

I don't think we are decades away, just think of Bitcoin crashing by "only" 50% in price while the next halving kicks in you can't argue it hasn't been like that before, since 14 years of history and few halvings are not a very accurate statistic - suddenly the reward would be only 25% of what it is now, probably causing shutting down more than 50% of HR which would be available for potential reorgs.