The Athletic article linked at the top of the thread says charter flights are very low on the players priority list, for the reason Gator suggests. There is support for a substantial raise in the league minimum, because right now too many kids can make more out of college than going into MLS. They also want to change TAM because a $600-800k foreign player can cost less against the cap than a $250-400k US player. And they think the ease with which teams get green cards for incoming players is hurting true or natural domestics, or whatever term you want to use. In the other direction, there was concern that homegrown kids with potential are going overseas too much, and the league needs to do more to incentivize them to stay. There was a mishmash of ideas, including having homegrowns never count against the cap, making supplemental roster spots (which don't count against the cap) more flexible. They also mentioned getting rid of homegrown territories, though I don't see how this helps with cap issues. I think they just want it.
Finally, the article was based not on a widespread poll of players but talks with about 15 guys. That doesn't mean it not representative but, who knows.