Weeelllll... Bladders are not a good choice for waste holding...But--
But I'm also a big fan of "if it ain't broke, don't fix it" (that does NOT apply to preventive MAINTENANCE, however!). So yes, I'd advise replacing the bladder...but whether to do it now or live with it a year or two depends on a couple of factors.
1. Age of the tank...average lifespan of a bladder is about 15 years at best. So if it's getting close to 10, might as well bite the bullet and replace it now.
2. Is it vented? CG regs prohibit the use of UNvented bladders for sewage or gray water holding. So unless your tank is vented to the outside of the boat, you'll have to either install a vent or reroute one that's routed into a lazarette or locker to a new vent thru-hull, or replace the tank.
3. You said, " The holding 'bag' is empty and there is no smell in that area, but I'll replace that stuff I guess." That's a good sign that the tank isn't leaking. However, you said "no smell IN THAT AREA"...but unless there's odor in the lockers etc the hoses pass through, there's no need to replace the tank or the hoses yet. However, it's winter and nothing stinks in cold weather and the tank is empty--prob'ly thoroughly rinsed out by the seller, maybe to eliminate some odor...so the real truth about the tank and the hoses will out when the tank is full in warm weather.
4. No odor INSIDE the boat does not guarantee no odor out the vent when the toilet is flushed...I've known quite a few owners who claim to have no odor from bladders...folks who happen to be downwind when the toilet is flushed disagree. However, owners of boats on which the tank is vented out the transom are blissfully oblivious to it because there's no odor on the boat. But I have met a few--VERY few--who actually have no odor from a bladder....Marty may be one of 'em. We won't know whether you'll have odor out the vent till the weather warms up and stays warm for a while.
So while I definitely recommend replacing the tank, I don't think there's any urgent reason to do it before the season starts. Let's see where things are in July.