Can transaction id be used to verify a transaction? I have seen alot of questions here on "Transaction Malleability issue". Editing of transaction id can be done by miners or nodes which relay the transaction. 
What I want to know is 


whether the tx_id can be used to verify whether a transfer occurred successfully or not? 
Is the issue restricted to bitcoin only? What are other coins in which transaction malleability can occur ?
Will it be solved in future upgrades of bitcoin core ?
Can tx_id be used to retrieve raw transaction info (as it is public) ?
Indeed malleability means that the tx_id can change as long as the transaction is not in the blockchain yet. That means you can NOT rely on the tx_id. But:


Once the transaction is in a block that is part of the blockchain, the tx_id does uniquely identify it and can be reliably used forever in the future to refer to it.
Basically all other coins ever forked from Bitcoin have the same (and many more) problems.
In Bitcoin it's already fixed by SegWit. The tx_id for SegWit transactions can not be malleated anymore (except by the person who has the private keys).