Do you think robotnik would be sad...

if he finally killed sonic?
your reasons?

 

No. He's under the impression he succeeded in SA2, when he jettisons Sonic into space and blows him up. He's quite happy about it, IIRC.

 

Eggman is very damn proud of himself after killing him in SA2, but we don't get to see the long term effects of his death on the good Doctor - mostly because Sonic improvised his way out and met back up with him.

Short term effect: :D, except INTELLECT-STYLE. He can get along with trying to take over the world with no distractions. Well, except Tails. And Amy. And Knuckles. And Shadow. And GUN. But hey, none of them have ever beaten him on their tod, have they? This is pretty much all we saw in SA2.

Long term effect: likely some form of... withdrawal? Regret? Sure, Tails would probably start saving the world in Sonic's stead, but a slow-but-smart flying fox is very, very removed from a speedy and impulsive hedgehog. And if Shadow decided to do it instead, he might have the speedy hedgehog thing down, but his personality is knife-like and straight-to-the-point. It definitely wouldn't be the same. Also Eggman'd probably get his neck snapped at some point.

But Sonic... There's a particular challenge there that nobody else in the main cast could give Eggman. And it's planted in his attitude as much as it is in his abilities.

Besides, about ninety percent of everything he builds has been build to stop Sonic (and only one to stop Tails). His inventive and creative streak seems to very well depend on the kid. Remove that inspiration and suddenly the only thing Eggman is building are the robots that do his bidding and, hey, they don't even like him very much. And before you say Eggmanland (his motivation in SA1), he finally built that in Sonic Unleashed. It's an extensive carnival of horrors and it was build to... stop... Sonic...

...

 

I agree with Umiyuri, Robotnik might start out proud of himself, but the regret is still there. It's like in Phineas and Ferb, when doofenshirtz thinks he destroyed perry the platypus. He is proud for a moment, then he says "Why do I feel so empty?" lol, Now don't get me wrong, I do not in the least think that doofenshmirtz is in the same league as Eggman, but hey, the same feeling is there.

 

It's a very big 'if' that Robotnik would actually win. He's awsome, but he's also fail at the same time. He's fail-awsome.

Regarding the actual question, I think yes. Sonic was the only one who actually game him a challenge. He'd be bored to death once he had won.

 

I don't think we'll ever really know.
Reminds me of Megamind though.

 

Tails defeats him in SA1, and I'm pretty sure he does something in Tails' Adventure. Shadow can go against him in Shadow the Hedgehog. GUN regularly halts his progress. There's no lack of challenge left.

An argument can always be made for the long term, because we're never going to see an Eggman victory. But from past actions, it seems as though he'd be quite pleased to be rid of him.

 

I think he would be sad. They maybe enemies but what would he do if Sonic was dead grow old and fat? Oh wait he already is lols