As far as solutions for scaling go, it is possible that the constant and fast pace introduction of new altcoins could eventually provide enough increased network capacity to ease the load of transaction volume on bitcoin's network. Bitcoin will probably never achieve 1,000 transactions per second but if we add 1,000 new altcoins which can achieve 1 transaction per second we can distribute the transactional load in a way which could alleviate those shortcomings.
I also believe that the solution to scalability problem of bitcoin alone is to use altcoins so that the volume of transactions would diversify making the network of bitcoin still convenient to use.