Default [Q] i9500 will be obsolete soon?

I brought this phone without knowing it doesn't has AOSP support, i wanted one of the actually best phones to stay with it like 2-3 years whit good software and hardware, now i found out this i just realice i am samsung-dependient on this phone i am wondering if i should change it if my expectatives is have a great phone for about 2 years

I KNOW IN 2 YEARS WONT BE A HIGH PHONE , but samsung s1 has like 4 years old and can have lastet android in custom (has a bit of lag but works cool), but SAMSUNG officially only give support to 2.3.6

PD: I dont mean to keep it 4 years, but at least 2 years

What do you think? I sell it and buy another?