Buying Twhirl - A Seesmic shift in strategy?

Seesmic is buying Twirl, a Twitter desktop client, notes TechCrunch:

San Francisco video/chat startup Seesmic has acquired Twhirl, a popular application created by German developer Marco Kaiser that allows users to access the Twitter service directly from their desktop, and also cross post to other services like Pownce and Jaiku. The acquisition price is not being disclosed.

They didn't say why, though (to be fair, as investors TechCrunch noted they would not say too much). But this is an interesting shift of focus for a Videoblogging startup to buy a textblog desktop aggregator, so I wondered what drove this move. Seesmic's own blog was fairly - ummm...obfuscated? about this, listing a plethora of reasons (see here). Sorting the wheat, I saw these reason:

-Staying in touch with your friends using microblogging is much easier using a client than through your browser
-Thwirl is the #1 and coolest Twitter client with more than 100,000 downloads and 7% of all tweets posted per day

Having played a bit with Seesmic, I'd say that staying in touch with your friends via text based microblogging is a lot easier than using videoblogging, as there are far more opportunities to create and consume text based posts than video ones. Thus a videoblog needs to extend its window as far as it can, hence requiring a desktop system that can work when you are offline.

Also, Twhirl is a different business to a microblog or videoblog - its an aggregator - and its very clear from the second line that its got a wider application than any one XX-blogging service, thus de-risking
a pure videoblog play.

Conclusion - Videoblogging has a limited runway compared to text blogging (today at any rate) and this is a way for Seesmic to shift its focus from video to overall "microblogging".

Update - Kosso makes a good point on the GigaOm comments:

Systems like this have been waiting to happen for a long time. Recent changes in the flash video serving economy have made it easier, so I expect we’ll see more thing ‘like’ this soon.

Yes, this is all part of the evolution of the video based industry, but I just don't see these sorts of services operating standalone - see some of our more analytical reasoning here.