100% load is 100% load. Games that load up the card more in the future might load different areas of the GPU, but I'm seeing 100% utilization on my 680s in BF3 now so I don't think you will be worse off in the future.My biggest concern is for people who are going to keep the card for a while. I'm on a 3 year upgrade cycle (after 3 years, I pick at what point I want to upgrade -- this time its Ivy). Back in 08 when I picked up my 4870, I'm sure most games didn't push the card as hard as 3dmark 08 did. I'll bet that BF3 pushes my 4870 just as hard or harder than 3dmark 08 does.
What I'm saying is, in 3 to 4 years, I suspect I won't be getting much over base clock anyway since games will (hopefully) be much more demanding. Sure, I'll still WC the card and all will be well, I'm just not sure the dynamic clock is really something to be all that excited about in the long term.