I believe nothing is impossible, but ETH has a very solid base and many project are base on ETH platform. However, XMR is one of the few coins to actually grow in value and maintain an uptrend.
In a nutshell, it will be very difficult to conclude that XMR will surpass ETH, both Ethereum (ETH) and Monero (XMR) are tipped to do well over the next five years. They are, therefore, good investment opportunities.