Your fork will have coins pre-distributed so you don't have the problems with early adaptors.
You might be overlooking the obvious.
The spend transactions from the "pre-distributed" coins would be valid on both sides of the fork. Thus if bitcoin is trading at $90, let's say, and you are asking me to pay 10,000 ?TC for a pizza then I'm certainly not going to be using my pre-distributed coins and instead would only be using ones whose coinbase occurred post-fork.
And even putting that aside, you've got a fork that is extremely vulnerable to 51% attack.