Just as 2015 was the year of the altcoins, and 2017 was the year of the tokens (why mess with a software project when anyone can create an ERC-type token effortlessly, plus there's no mining so you can sell every last bit of it day one), 2018 will be the year of the forkcoins. Things like Ethereum Classic and Bitcoin Cash are just too lucrative to pass by.
Expect to see Ethereum Black, Bitcoin Plus and Litecoin Gold. Each with a subtle change from the parent in block times, hard caps or other parameters. More than one will also try to steal old unspent UTXOs (including Satoshi's) for the developers themselves.
Every improvement to the underlying protocol will see a lot of manufactured dissent to lay the groundwork for a fork, even regarding opt-in features (such as segwit and p2sh).
Eagerly awaiting being declared a fool in 2019!