If the features are significant enough to convince a CIO to change browser than yes. If the product is not ready for mainstream release for the next 12 or 24 m

If the features are significant enough to convince a CIO to change browser than yes. If the product is not ready for mainstream release for the next 12 or 24 months then yes. If it's only slightly better than IE compatible alternatives and you want people to use it today then no. Personally I believe now is the time to start taking a risk with HTML5 only - when it does go mainstream you'll be ahead of the pack.