1. What will happen to alt coins when Bitcoin becomes a legal tender? Will they have a massive growth,or would people sell and jump into Bitcoin?
the course will do same , People will jump to bitcoin but others will also take the advantage as other altcoins will surely have their chance of coming to be adopted as well.
2. What would happen to alt coins when Bitcoin becomes relatively stable( when it is fully mined and will solve its problem of price volatility)? Will alt coins survive the test of time? Will new alt coins be created later? What would become of the various countries'currencies, especially the Dollar (the global reserve currency) after Bitcoin's general acceptance?
Altcoin had been the biggest part of Bitcoin growth because if altcoin is not created Am not sure if bitcoin will rich this high.
We knew that Bitcoin becomes more popular because of altcoins presence .
3. If alt coins survive in the next century what is the reason it would.
because they are helpful mate and yes because of their true value and creation.
4. Should alt coins be traded rather than HODL?
I hope my questions aren't too many.
Thank you for your time once again.
actually you miss the point , crypto must be use as payment and not just trading and holding .