Not so sure. If the pending tax increase were a real reason for lack of investment, then a 2-year postponement will have absolutely no effect on investment decisions. Period. Waste of money. No one starts a business because a prohibitive cost is postponed two years. No one.
The hesitancy on business's part stems from (a) absolutely unknown healthcare cost increases resulting from the new law, (b) absolutely unknown energy costs due to cap and trade, (c) absolutely unknown business operating environment due to expectation that EPA will regulate carbon even without cap and trade, (d) spending and government growth in the face of already unpayable debt - which means the only answer is bankruptcy or taxes (like energy costs) "necessarily skyrocketing", and (e) no end in sight to the "safety net" programs Dems want to provide while at the same time pursuing an open-border policy.
There's more, lots more, but the point is there's little to be gained by a *temporary* compromise on temporarily extending the "Bush" tax cuts for >$250m. It doesn't remove uncertainty, because this specific tax increase is NOT the problem.
It's policy, ideology, and what has to come next if we don't change course quickly. The math just cannot work.