They're doing brilliant work, but I do think they'll crash and burn at some point in this season because of European competition.
That's true - they might find it hard to juggle it all, but that's normal for a club their size when you've spent relatively little compared to the bigger clubs, and have been trying to slowly progress since promotion. Crash and burn is more akin to what Chelsea and Utd do - clubs like Brighton are allowed a wobble now and then or a difficult season, given the size of the club and the relative spend/wages.
Since promotion in 2017, they've finished 15th, 17th, 15th, 16th, 9th, and 6th. This season is still young, but 4 wins and 15 goals in 5 games is a solid foundation, and it wouldn't surprise me if they finished in the Europa positions again (or very close). They've clearly taken a few seasons to find their feet, build a system, build an analytics/recruitment network for PL football, and developed their style of play. They also made close to £200m in transfer sales this summer, and have spent less than half that on new young players.
That's what makes Potter's move to Chelsea seem so odd - he left a great project to join a club with no footballing identity or strategy, which was going backwards, and a club who give managers no time to build a team or any long term plan. He was probably seduced by a megalomanic owner with big pockets and a bigger ego, and thought the step up from Brighton would be smoother.
Brighton then qualified for Europe the season after he left, Chelsea finished 12th, and he was sacked.