Don't ignore it. Right now you have a switched red wire that quite possibly terminates somewhere in a wall or ceiling. That is a potentially dangerous situation. Disconnect it from the switch and cap it off. Disconnect the hot from that switch too and remove it. If the ceiling box is still hot then a new fixture should work off the remote. You can leave the disconnected switch in the box if you want - it will now be a switch both to nowhere and from nowhere. However, this will still be a code violation since you need a switched fixture or outlet somewhere in the room. So I would try disconnecting the two remaining black wires from each other and capping them separately. If only one is hot when you turn the breaker back on, then you can connect them to a single pole switch for the ceiling fixture and just leave it in the on position all the time so that the remote controls everything and the whole thing is to code.
Disclaimer - I am not an electrician; I don't play one on TV; In fact, I didn't even stay at a Holiday Inn Express last night.