i dont think GTA 4 should harm mta:dm's glory as gta4 wont be coming to pc until about a year from now.
So people without a X360 or PS3 like me will play mta:dm for a while until gta4 comes out on computer.
It would be awsome if in an RPG server,
you could buy houses and store you cars their and everything, maybe when you play MTA again you start of in your house.
And it could be scripted that you can sell your house and someone else can buy it.