If ratings suffer, a change will be made. The Penguin can carry the show all by himself for a while if needed.
The best news for the show is many characters have established themselves, and the Joker who appears to be the son of a blind fortune teller and cirrus snake handing ****e has yet to come out! The actor who played the apparent Joker was scary good.
Other plots include:
The the bat cave was just discovered.
Jim Gordon has aligned himself with Don Falcone, the #1 bad guy out of necessity.
Wayne Enterprises has been introduced with tons of corporate villains.
I think the show will improve and become better. I remember back in the 1990s when Star Trek the Next Generation began. The first season was uneven, but by the end of it, they found their sea legs.
I think Gotham is similar. Now it knows where the chemistry is, and which actors can best ignite it.