I too wrote UA about this and got back the same form letter. They claim that the web site does as much as the software version - well, I don't think that it even comes close.
The thick, downloadable software version is much, much faster. It has a "Super Shopper" feature to search a span of multiple days, and it's hotel checker, price, and availability feature is unsurpassed by any other engine out there. It is a real shame that they are removing this.
The web site feature list doesn't even come close. I can see why they did this - they only have to support one and it is easier for novices.
I wonder if we can start some sort of grass movement to tell them how much better it is and to continue to support it.