But yet, it is the end of the world that they can't buy the upgrade to MC21?
I'm confused. Do they have money to spend on software upgrades, or don't they?
end of the world if they can't buy MC 21: I don't see that this relates to anything that I said. It is usually much cheaper to get business from existing customers than to acquire new customers. Checking with XP based customers before you cut them loose might be prudent. If few are expecting to upgrade MC further on an XP computer, JRiver is free to go ahead. (See the sample message beloew.) However, if a significant number are expecting to continue to be able to upgrade on XP computers, JRiver may want to modify its plans.
money for upgrades: Some have the money and some don't. Outside the world of computer techies, people don't look forward to spending money on computer hardware or software. However, when something breaks, their priorities change.
willingness to upgrade: Outside the techie world, people often use the same OS on a PC until they replace the hardware. However, during the life of a PC, an MC user might upgrade MC several times. It is (usually) straightforward to do so compared to an OS upgrade.
JimH would not have asked the question in the OP if he felt that JRiver no longer had customers using XP or might get new customers who used XP. The thread had lots of pronouncements by techies who didn't seem to have any empathy for XP users. I tried to get a different point of view into the thread. I listed some thoughts that might be in an XP users' mind. I don't expect that every XP user would have all of these thoughts.
At the beginning of my post, I said that JRiver should be getting feedback from XP users. JRiver should try to get information from and about real MC users on Windows XP before planning the end of support for MC on XP. That would be a prudent step.
JRiver may find that XP users are not likely to yield much upgrade business until their PC running XP gives up the ghost. However, that will probably happen in one to three years. At that point, those users will be buying a new PC with a recent version of Windows and installing software. They might be quite receptive to an MC upgrade then. (Or an ID.)
I could imagine that JRiver might announce the change in support with a positive email like this:
"As we develop MC 2x for Windows, we will be using features that are not available under Windows XP. MC2x will not work fully under XP. We recommend that you continue using MC2x-1 on computers running XP. When you are ready to move to a later version of Windows (7,8 or 10), consider upgrading to the current version of MC."