The correct answer is "continue to wait". Modern solutions suck, but videocard output compression is something that is in the process of becoming native to Nvidia cards and Steam . Then you just need a dirt-cheap PC or a custom CE box similar to a Roku/AppleTV for decoding on the TV side. It's all still pretty early stages, but we should have some reasonable solutions by this time next year.
The best solution today is: Build a second PC for the TV.
Punching holes in the walls and running long cables is not a solution. It's a kludge at best, and it's stating the obvious.
" I would assume the wireless solution won't work due to latency"
Wii U uses on-the-fly video encode and transmission and it is lower latency at 16ms than most people's HDMI cables to their HDTVs at 33ms. It's already proven that it can be done, it's just a question of whether anyone will deliver a quality solution for PC use. There are 1080p wireless HDMI extenders in the $200 range, but you would certainly want to research latency on any specific model before making a purchase. I would imagine being an outboard piece, that you add another 33ms or so, resulting in the final image being 4 frames behind the PC render. Compression artifacts may also be an issue.