At least your 1.5 Mbps DSL would have much lower latency, so web surfing would be reasonable.
WiMax was SUPPOSED to take care of all the remote boondocks subscribers with up to 6 or even 10 mbps and NON-line of site coverage for "cell zones" up to 35 miles in diameter.
And then suddenly the FCC decided it wanted to auction off pretty much the entire spectrum space that WiMax was supposed to use.
And now that's the end of that here in the USA far as I know.
Strangely enough, Haiti is now one of the biggest WiMax users.