The Big Bang Theory Season 10 could be the last for the show or it could extend for more seasons. No one knows since the future of its main cast is still up for deliberation.

All of the regular cast members of the Big Bang Theory Season 10 are up for renewal at the end of Season 10.  Kaley Cuoco, Jim Parsons, Johnny Galecki, Simon Helberg, Kunal Nayyar, Mayim Bialik and Melissa Rauch have yet to sign new deals. The cast is reportedly asking for a pay rise before signing new contracts.

Cuoco (Penny), Galecki (Leonard) and Parsons (Sheldon) are currently among the top earners on television, earning $1 million each per episode. If the latest rounds of salary negotiation do not pan out, can CBS replace Sheldon, Leonard and Penny?

Of course they can. The show’s storyline can also make changes depending on the outcome of the negotiation. Showrunner Steve Molaro said: “We don’t really arc out stories too far, and we let things happen organically, and if things catch us by surprise … It’s more of that and if and when we know something that’s actual information that can be helpful [regarding the contracts], we may do something differently, but until then, we’re sticking to the game plan.”

However, the network might not take that chance to replace the three main characters since it will greatly affect the show if it happens. Even Molaro admitted that the series will be “different and weird” when even only one of the characters left.

Check out the Big Bang Theory Season 10 teaser below.

Can you imagine the Big Bang Theory without the trio? Or even one of the main characters?

The CBS hit comedy show has been dominating the ratings since it premiered in 2007. Through the years, the four Caltech scientists and their ladies have been household characters. In the 2015-16 season, the Big Bang Theory averaged 20.3 million viewers, Los Angeles Times noted. It also garnered a 5.8 rating among the 18-to-49 age group, which is the most sought group for advertisers.

The Big Bang Theory Season 10 returns on September 19 at 8 p.m. on CBS. It will be back on its regular Thursday timeslot after the NFL coverage on Oct. 27.

Stay tuned for more Big Bang Theory Season 10 news here.