"Python 2 is fine now – but in the coming months and years new libraries, features, and performance improvements are only going to be introduced in Python

"Python 2 is fine now – but in the coming months and years new libraries, features, and performance improvements are only going to be introduced in Python 3, and I didn’t want to get left behind or forced to take on an expensive and time consuming port in the future." Does this argument hold some water, or is Python 2-to-3 conversion often pretty trivial in practice?