It's not just the money, these guys like the status of being all-NBA. Three things that I'm confident of, to varying degrees:
1. Giannis will make all-NBA again this year, regardless of how many games he plays. It's no use getting fired up over a situation that, even if we apply the minimum games rule retroactively over NBA history, rarely happens. If this rule had been applied during the last CBA in December 2016, absolutely no one would be worried about the situation you're describing above.
2. Giannis (and other healthy stars in their prime) will make a greater effort going forward to hit that 65 game minimum for EOY honors (and barring serious injury they'll make it easily, as NBA players have done for generations before the last few seasons). These things matter more to some players than others (obviously younger guys want that super max eligibility, and players a few years older are looking for the recognition that comes along with winning MVP or 1st team all-NBA), but with a handful of exceptions, I think it's just gonna be the older guys who have already made their names, money and legacy in this league who won't attempt to hit this threshold. Lebron, Durant, Curry, and the handful of guys still in their primes who are legitimately injury prone (Kawhi, AD) are going to be the only ones who are likely to completely ignore this.
3. It's better for the game for the regular season to have star players playing more often. MAYBE it leads to more injuries down the line, but the last few seasons still feel like that standard war of attrition that the playoffs always end up being.