Personally I plan to get an Xbox 360 + Shadowrun + Gears of War + Viva Pinata this fall, and a PS3 + VF5 + Tekken 6 next summer (and hopefully import FF13 in fall 2007 if the "region free" rumors actually turn true, you have to know that FF12 was delayed because half the team started to work on FF13...). I've been playing mostly PC games in the meantime...
I just don't think PS3's launch titles will match 360's fall lineup. This year is your main chance to get a 360 if you want to be a dual console owner, if you pick up PS3 AND a 360 next year that's a $800 hit just for the consoles, my wife would freaking hang me.
I had heard from very reliable sources that VF5 was coming to 360 next summer so this is a bit of a surprise, shrewd move on Sony's part to nab the timed exclusive for this. It might still make Fall 2007 on 360, but by that time we will be in a deluge of gaming goodness on both consoles and VF5 will probably be the last thing on our minds.