There is far to much memory to allocate, your computer would be lagging behind everything you do, and the kid next to you with 2 gigs will be laughing at you.
Oh, and in 30-40 years there will be computers with 1 TB of RAM, but then on those computers you will have simulations of real life, full and depicted with full VR. Trust me, Bill Gates once said that 64K ought to be enough for anybody, and look at where we are now.