I think if there is anything I've learned over the years is that anything is possible, but I don't see them forcing everyone to PHP 5 in the near future. There are so many commonly used applications installed in users' accounts that are not PHP5 "ready", that I suspect they will continue to allow us to choose which version we want to use for a good while longer.
You might want to double check to see if you are still actually using PHP 4.4.2 by using a phpinfo output, as my PHP 4.4.2 domains were recently (quietly!) upgraded to 4.4.4 .
This is a "good thing"tm, in my opinion, as there were some notable "bugs" in 4.4.2.