(1) Can we see LTC price at 200 after 5 years and Etherum 1000 after 5 years
Yea, thats perfectly possible.
(2) Where we can securely store our LTC , any online wallet, please advice...
Electrum from LTC or Coinomi if you want a hot wallet. Otherwise go with a paper wallet from walletgenerator.net. Avoid online wallets if you can.