Options other than Sans' and Geno's? What could he mean?

Has Geno accepted that Sans might have ideas that he hasn't even considered possible, and just wants to see what Sans will come up with, as Sans won't go along with his crazy, possibly unworkable idea?

I mean... how would Geno even destroy the timeline? He doesn't have any practical ideas on how to do that, does he?

He's saying that Sans gave him two choices, but left out one: to effectively do nothing and let the looping continue without cooperating. Geno is hoping Sans changes his mind.

Shiitake said:
He's saying that Sans gave him two choices, but left out one: to effectively do nothing and let the looping continue without cooperating. Geno is hoping Sans changes his mind.

Perhaps. I don't think Geno will or can let Sans lose his memories again. As he's stated and shown, he can't go through with that cycle again.

And so, that leaves effectively Geno at the mercy of Sans' choices and motivation. Hopefully Geno has a change of heart while seeing what a fresh mindset can do. Chara has the potential to change for the better. If only Sans can find the key to Chara's healing.

Valmar said:
Options other than Sans' and Geno's? What could he mean?

Has Geno accepted that Sans might have ideas that he hasn't even considered possible, and just wants to see what Sans will come up with, as Sans won't go along with his crazy, possibly unworkable idea?

I mean... how would Geno even destroy the timeline? He doesn't have any practical ideas on how to do that, does he?

Geno has determination which is why he's melting and pretty much close to death itself, the only reason he's not dead is because he's in the main screen, the "anomaly". He can send Sans back, and he does have the determination to restart the timeline. that's why classic sans said that he could "start over" to redo everything again, and hope that "that" sans would cooperate with him only for him to do everything all over again trying to manipulate that sans into doing what he wants.
I think it's even been stated on how he would end the timeline, the world. That the minute Chara "dies" he would be sent back to the anomaly and Geno would capture him making sure he couldn't reset and go back. That would allow him to take control momentarily and he would go back to the real world and destroy it. But he even stated he only would have a limited amount of time to do so, because once he enters the real world again, he'll only have minutes till he would die from the determination. But that would be just enough for him to erase everything.
That and I follow loverofpiggies on tumblr so I read a lot about this as well.
So in a way Geno may be a bit more determined then Chara/Frisk, considering it does take a lot of determination to erase the world. meaning Geno actually has "god like" powers to be able to pull it off.

I'm not sure if he has any other ideas or plans, at this point it looks like he's just telling sans that he needs more time to witness it for himself; that he needs to feel what he feels. Even though that sans will never feel what he feels considering Geno is far too gone...he drove himself literally crazy.

It's too much for m heart to handle anymore, so why do I keep coming back?

...Because I'm a Sucker for stuff like this.

took me a little bit but I figured out what Geno just did, he's sending Sans back into the underground with Chara. I assume so he can truly witness the horrors that demon is capable of