Well, WandaVision is supposedly getting 9 episodes, with 2 airing on Jan 15th
each episode breaks down to roughly 40min each
Falcon & WS start March 19th
which would leave an empty week in-between the 2 series
Marvel did announce a "Legends" series, which could fill the gap(s) and give history on the characters getting shows and/or movies coming out.
I don't have the full schedule infront of me to speculate, but it sounds like Marvel could fill the majority of the 52 weeks of the next 2 years with something new from Marvel if they really wanted to.