This is very unlikely. If this technology achieves this level of success, it will be only a matter of time before someone implements it in a Bitcoin sidechain.
Yeah. Since Zcash is just a clone from Bitcoin, with the addition of Zero Knowledge Proofs, it can easily be ported into the pioneer cryptocurrency itself. So, implementing it into a sidechain would be ideal to reduce load from the main net.
When this becomes achieved, people will use Bitcoin more than ZCash, due to the privacy features, as well as being the top cryptocurrency in market cap.
Nevertheless, anything is possible in crypto land, and it should only be a matter of time before ZEC remains as the top Zero Knowledge proof cryptocurrency, or another one takes the lead.
We were just talking in a thread to promise that the cash was going to $1,000, LOL. Zcash is garbage it always was garbage and it's always going to be garbage the development team has nothing has no coding experience and all they did was clone a coin flip a few numbers in it changed a little bit in the coding and then put it out there like it's some kind of new special thing. If garbage is new well then I guess it is new.
You do have a point there, mate. ZCash is basically Bitcoin with a few tweaks such as ZK-SNARKs and founder's reward. Given that it has the same codebase as the pioneer cryptocurrency, its features can become easily implemented into Bitcoin itself.
If Bitcoin adopts this technology, then ZEC may lose its value since people would prefer to use the top and most popular cryptocurrency to secure their transactions. Add to this the upcoming smart contracts feature for Bitcoin provided by Rootstock, and the pioneer cryptocurrency will become the biggest blockchain ecosystem in the world.
With this in mind, ZEC would have a hard time to reach its original price levels, unless something new and exciting comes up for it. Just my thoughts

If the bitcoin adopts that technology, it might not be used by main stream users. So I think ZEC position is still secure.