"Can we make Jackson Heights more attractive, classy and Trendy?"
I personally hope never...not the way some people define "attractive," anyway. It's already very attractive to me as it is, namely its diversity and its location. It's interesting what some people define as "classy" and "attractive." Does one mean less brown people and less working and middle class people?
In any case, every single neighborhood I've lived in on both coasts of the US that's gone the way of "trendy" has priced me and other folks in a similar income bracket, only to be replaced by the moneyed who just consume, rather than produce, and thereby drive up the prices. To be honest, that's how I ended up in JH from Brooklyn.
I feel very passionately about gentrification and what it does to neighborhoods and the residents living in it and generally, I tend it view it unfavorably. Yes, JH right now doesn't have every single thing imaginable, but the beauty of it is that I'm within walking distance of several neighborhoods that offers basically anything that I need and desire. For a few things, there's the subway to Manhattan. I'd much, much rather prefer it like this than JH becoming a concentration of "trendiness" that will have effectively pushed out the very people that have made JH what it is. The Village, SoHo, Tribeca, etc are all "trendy," but culturally, I find it really homogenous, boring, and pretentious in my more ungenerous moods. That's the thing about rich people--they come in with their money and kick out the very people who made those neighborhoods vibrant, vivacious, and trendy, and turn it into a bland wasteland full over overpriced restaurants with mediocre foods at best.
If one wants trendiness, "classy" (what a term, frankly), and attractiveness, one can always move to SoHo, Park Slope, whatever. One cannot have everything in one place, especially in an American urban city.