A please stop wining, you can't expect to be sitting on the first row for a dime for years. Which we already did with DA in fact. And they introduced 2 new very nice options (personal and lite).
If you're plan to migrate falls down, you should recalculate. There are no professional panels using yearly licenses anymore. And it's not said that DA might come back with a yearly license at a later time, but with another setup, like for example 2 months less to pay (year license, pay 10 months or something like that), one never knows.
If you just take a license from your datacenter you will be off cheaper too, because the licenses here are only retail licenses.
DA never have screwed people and they never will, but if a company has to survive, you can't expect them to keep prices and options always the same. They have been very fair for 17 years and they still are. Find another professional panel where you can get for example a retail personal license for a hobby vps for $24 a year. You won't.
They are fair and they have always been. I don't expect this to change in the feature.
If you want to complaint, have a look at cPanel's way of changing prices, then have a look at Installatron raising prices with 40%, everybody is raising prices.
DA is still good for a fair retail price and even more cheaper wen you get it from the datacenter or vps seller.
If you don't want to migrate, it's your own decision, but don't complaint because after 17 years they made some changes to keep the company and support alive too. Compared with other company's this change was long overdue. I also don't like it, but it's normal and it's just a fact. Things always change.
And DA is fair.