So if they can't pull the DA trigger, then just cock the hammer back and shoot it as SA right?
Sure, you can do this with DA revolvers, but the reasons that I expressed a preference for SA revolvers are that they're more ergonomically designed for this mode of firing, in my opinion, and it is possible to hold down the trigger and slip-fire them with the thumb and hammer alone, which is not possible with DA revolvers.
So the choice here is largely between being able to reload more quickly (using speedloaders), and using a system that is better designed and optimized for SA defensive/combat shooting. However, note that since many people apparently do not even take reloading during defensive situations into consideration at all, the main advantage of DA revolvers is moot for them. Also, those who expect to have to reload could always use the Old West method--a second loaded revolver (which is probably more effective for both SA and DA revolvers anyway).
They are not obsolete but just not as practical compare to now days weaponry in my opinion,
They may be obsolescent in some obvious ways, but as long as they have a practical use, as I've just described I believe, then they are not obsolete--just underestimated.
but I would still love to have one,
Me too because the Old West-styled ones are just freaking cool!
And I've probably been brainwashed by watching so many Westerns during my childhood....
and wish I am gutsy enough to conceal carry it too. =)
As you probably know, some people actually do. The guns still work like they always did, and in skilled hands can be as effective as modern sidearms (unless you need lots of ammo, which is rather rare albeit not outside of the realm of possibility).