Depends on situation.
Like if someone is shooting a slow moving wedding in broad daylight. Yea of course you can use a kit lits and an entry level DSLR and get wonderful results. Even a PNS will get fantastic results. The only thing you won't get are funky effects that come with ultra wide angel lenses, telephoto lenses and large aperture lenses.
If someone is shooting in a dim ballroom without a flash with people dancing really quickly around the room, then you will not be able to do anything if you are holding an entry level dslr with a kit lens. In these situations, you will need a body that supports higher AF speeds, better ISO performance, a lens that will be able to focus quickly, have a larger aperture and a flash gun to be able to even shoot properly.
And of course, in both situations above, I'm assuming the 'someone' knows the technicalities about photography and can make the best out of his/her equipment. If that 'someone' doesn't know the difference between 2 bodies or lenses, it is most likely that even he/she is given pro equipment, he/she will only do as well as someone with entry level equipment.