Since I can only activate Creative Cloud on up to two machines. What happens if I stop using creative cloud on one of the two PC's and decide to change it for a laptop? Are there any repercussions?
you just install the cc desktop app on that 3rd computer and when you (try to sign in) it will detect that you're maxed out and offer to sign you out from the other two. allow it to do that and you have the installation on that 3rd computer.
from that point on, you can then sign in to any 2 of the 3 at any one time. likewise, with installation on more than 3 computers.
the only restriction is you can be signed in to your cc account on, at most, 2 computers at any one time. you're only supposed to use the adobe cc apps on one computer at any one time.