I agree with this, except I don't necessarily think of .net as old. Personally whenever I get around to getting a new domain, I'm planning on it being ".io".
As regards .online, it always strikes me as a bit of a <whatever the opposite of oxymoron is>
Dear John,
You have been invited to the president's birthday, please RSVP by post.
Attached you'll also find a PIN number. It's part of a free gift; true fact! Just use it on any ATM machine.
Best, Tim
PS: could you please bring some chai tea?
OK. I'll play:
1: Please RSVP 2: PIN number 3: Free gift 4: true fact 5: ATM machine 6: Chai tea
PS: PLEONASM sounds like a Spoonerism.