I think that you will make it. Last year it took me an hour after landing to arrive at my resort. So even if you dont get to your resort till 2pm, you'll still be able to get to the restaurant in time.
I agree with Glendamax... it took us 1 hr from landing until we reached our resort and this happened twice using DME last year. Even it if it took longer, you'd still be in good shape.
I think you'll be just fine, regardless of the mode of transportation. We usually land around lunch time and eat in a park restaurant at 5 or so too...we've never had to rush around to make it in time.