As Meng said they were looking into the "legalities" of using the Sonar brand name.
Trademark laws are probably complicated. If they had bought the company it would have been straight forward.
Personally I have no problem if they gave it over free to people who have Sonar HS 3 as their latest DAW.
The more people using the software the better for everyone.
The only reason Sonar will live on is because it has a huge user base. This is the big appeal to Bandcamp... and possibly half of those people are using older versions. And a big portion of those might even be pirated copies. So what, not their problem. Water under the bridge.
Upgrading has always been split into 2 camps.
People who want the upgrades IMMEDIATELY and can't seem to get enough of them.
And people who casually upgrade when they have the spare cash and feel their copy has become a bit outdated.
It is your choice to be willing to spend your money on updating software. If you choose to continually purchase the latest versions you will have spent more than double what the casual updater will have to get to the same place right now. The price you pay for being cutting edge. Nothing wrong with that, but one should not feel they have elevated status as a customer.
Basically the updates are important to some and not important to others. Both camps are still just as loyal to the software.