Problems with the time for processing a single transaction, and sometimes even a complete denial of the service of small transfers made the investors look for an alternative. As a result, the capitalization of individual crypto-currencies has increased several times. At least 3 crypto-currencies today have high chances and real tools to outstrip bitcoin by capitalization in 2018.
Yes, transaction speed in bitcoin really need to developing more. it is because the blocktime of bitcoin is long.
once the transaction speed is increasing, bitcoin will be the best cryptocurrency coin ever.