@SheriP0474 

RE: We don't want to go to the Online Edition and our clients don't want to go to the Online Edition.

Your and your clients appear to be smart and discerning people.

RE: We still get new clients that we would like to add a new company to QB utilizing our desktop version.

You will be able to add new companies using the copies of QuickBooks that you have.

RE: I want to make sure I can still continue to add new company's and manage their books before I set them up...

However, after this September, they will not be able to purchase QuickBooks 2024 - except Enterprise 24.0. If by 'set them up' you mean have then purchase a license of QuickBooks, they won't be able to do that.

RE: Can someone give me some insight to this change? 

Someone at Intuit thinks the Online solution is a replacement for Desktop, and a reasonable upgrade from QuickBooks Desktop. They are of course wrong.

RE: Am I going to be forced to convert all of my clients to the online edition (which we don't want to do and may find another bookkeeping software before ever doing that).

Well, no one can actually force you to upgrade to Online. I'd figure out a way to use Desktop for as long as possible, such as by getting all of your clients on 2024 while they still can.

Buy it here: Intuit - QuickBooks Pro & Premier 2024 purchase page 

Maybe Intuit will get the message that Desktop users basically hate QuickBooks Online. And if they refuse to 'upgrade' to it, maybe they'll keep supporting 2024 past its standard 3 year window - or even version it again.

I doubt it, but it might happen if they can't get enough people to use QuickBooks Online. Which in turn, given its dismal state, seems quite plausible.