Yes well I think so after the ethereum fork your amount of ethereum would still be intact but you would be airdrop the new altcoin
There is no new altcoin. The upcoming Ethereum fork (Constantinople) is an upgrade only, not a split in to a new coin. It plans to implement 5 Ethereum Improvement Proposals (EIPs). The upgrade aims to (very simply) make several things you can do with Ethereum more efficient and therefore cost less fees, and also continues the progress towards Proof of Stake.
You don't have to do anything with your Ethereum, regardless of where it is stored.
You can read more about the upgrade here:
https://github.com/ethereum/pm/wiki/Constantinople-Progress-Trackerbut what is stopping miners from continuing to mine ETH and not accept that fork? it is basically bricking their miners in one hard fork swoop after all. i believe that is partly the concern that people have which has the risk of splitting ETH chain into two and some are thinking about the extra coins that they are going to get.
on top of that there has been a lot of drama about other forks with different names. i have heard of at least 2 others, one of which was a joke and died off fast.