I certainly believe that more than enough people are multi-monitoring these days. I see them in office cubes much more often than I ever have in the past. Furthermore, just look to Windows 8 itself: It's multi-monitor support is far superior to Windows 7, so that tells me that MS also sees it as an important environment configuration. And that's all the more reason why I am perplexed that the Surface Pro, which runs Win 8, does not do equal justice regarding multi-monitor support by taking advantage of and implementing functionality natively provided by Windows 8.
Regarding the HDMI output, I had originally looked into all those other types of adapters when trying to find a workaround. However, as I previously indicated, displays are very important to me and I wasn't willing to give up my 2560x1600 resolution on my external monitors, which is what I had been using all along on my old laptop, prior to replacing it with my Surface Pro. The Zotac, for example, does maximum 1920x1200. Although that's HD and is still great resolution, what's more important to me is to maintain using 2560x1600.