Oh, please, let's not make up silly conclusions. The world stayed away because the Qatar event being by so close. Players staying away had nothing to do with the smaller table. Same things happen every tournament if there's a scheduling conflict.
I think that scheduling conflicts are
largely to blame. Most the young gun Pinoys (and other ones who didn't get the invitation to Stage 2) are playing in the qualifying events in Qatar. The Europeans were all playing in the UK Open 9b event, which had free entry and was worth Euro Mosconi Cup points.
That said, there were a few pros who seem to have skipped the event because they wanted to prepare for the World 9b by playing on 9' tables. Daz said as much on FB and has been practicing at home.
To return to the original question, the switch was made because (a) CSI owns the rights to the names; (b) it is apparently considerably more expensive to stage an event like this on 9' tables; and (c) CSI gets considerably better PPV numbers from 7' events. It may also be the case that CSI likes being able to have their league players in Vegas see the pros playing on the same equipment the league plays on. None of this is a criticism - CSI runs a business and no one else is putting up the money to run these events on 9' tables.
I unfortunately didn't see the 10b, but I did watch almost all of the 8b.
When the balls broke wide and didn't cluster, it was easy run outs - except that even the top pros do still miss occasionally (e.g., both Thorsten and Busty missed fairly easy shots in the side right at the end of their respective matches. Thorsten survived - Busty's miss was at hill-hill and he lost to SVB, who would have been eliminated).
When the balls did cluster, it was fascinating to watch the pros navigate tables that would normally result in multiple innings and safeties. I strongly recommend anyone who plays any 8b on 7' tables watch some of these matches - it redefines how bar table 8b can be played, IMHO - although some of the shots and patterns they play can only be played when you are pro speed.
All of that said, I personally would like to see these events on 9' tables, but that doesn't mean that the events are not worth watching.