Well, I don't think the West would necessarily have to drop the Gangsta shit ENTIRELY, but yeah, the way the business is now, they'd have to at least record more love songs and party-type shit for the radio then what they do now. But it may not even be that simple...
I mean, even when the West WAS on top sales-wise (early/mid-'90s), the East Coast media was reluctant to accept rappers outside the East even then. NWA, Cube, Ice-T, CMW, Hammer, Too Short, and others made enough progress between '86/'92 to make folks take notice, but NY still had a "get off our turf" attitude.
I think what happened, though, was that Death Row became SO huge that the NYC radio/video outlets almost HAD to play Dre, Snoop, Tupac, and other West rappers, but think about this: that doesn't mean that these same NYC media folks LIKED having to do so...A lot of the NYC media folks probably (and this is just MY guess) had the attitude of "well, this West Coast shit is what's selling NOW, so we'll play it now like the other states are doing, but that doesn't mean we have to LIKE it. And as soon as we see signs of slippage sales-wise from the West, it's back to playing all East Coast rap." And the West DID slip sales-wise around '97/'98. The NYC media probably feels the same about the South as well--if the Southern Rap scene ever slips just a little sales-wise, then that region can kiss its' NYC radio/video channel support goodbye as well, because that will be the excuse for NYC media folks to say, "well, the South's finished, we don't have to play THEIR shit anymore," just as they (MTV, BET, etc.) deemphasized the West around '97/'98 or so.
And now that the East is back on top (sales-wise), the media folks in NYC are probably not about to (as they see it) let anyone outside of NYC "take control" of them again, unless, again, the sales or airplay from a West rapper is SO huge that there's no choice. In the meantime, Wallnutz has the right idea: West Coast rappers need to just stay on the grind, and do what they CAN do for now, and maybe something better will come along...whatever the case, I'm a West coast rap fan for life!
PEACE!