I don't see why people hate Eagle so much, I mean, the interface isn't all that nice if you are used to the standard way of Windows, I picked Eagle up a lot quicker than Altium, and Eagle although initially a bit daunting, not so unintuitive when you figure out some basics.
Yes Altium is good, if you can afford it, half of the features you don't need or will ever use, I would expect it to be 10x better for 10x the price, I can't see though that there are that many things you can do in Altium that Eagle can't do, it will be done in a different way, but thats personal preference, it might be harder to do in 1 package than in A N other, but again, you get used to it.
I have to use certain packages for work purposes, some I like, some I loathe, if I was working alone I would probably use Eagle all day everyday, yes DipTrace is a strong contender, but, you try both and pick the one you prefer, I find the library editor in eagle a breeze to use.
If Altium did bring out a low cost contender then yes people would try it, but the fact is that Altium is expensive, a low cost version would have to be quite special to complete with Eagle in my opinion, and they would not shoot themselves in the foot as they would lose potential sales in their normal Altium version, so for that reason I can't imagine they would ever bring out a useful low cost version, and how many would actually use it.
I see a lot of comments about Eagle being for "hobbyists", its a big part in the hobbyist community because they have a free version, if they didn't then more people would pirate professional packages such as altium and that would become the "hobbyist" tool of choice no doubt, DipTrace is low cost, another reason for being a part of the hobbyist community, I cannot honestly say I have seen requirements for a PCB designer to be using DipTrace, KiCAD (Which is also quite good for what it costs, free!), or any other package in such class, I have seen Altium, OrCAD and a surprising number of Eagle in professional (and military / government) job requirements, backed by E14 also makes it a favourite to a lot of professional companies, as most components come from Farnell / Newark etc.
Proteus is the best tool I have used for simulation of uC's, Eagle can integrate LTSpice, I haven't seen Proteus in any job requirements though, I am in the UK (South West), so I can only comment on what i've seen in this part of the world / country.
I know Eagle is quite big in France also as I know EE's in France who say it is more of a standard within professional companies over there, again, might be regional, but still.
Just my 2p's worth.