I had this same question a few months ago. The easy answer is no. Put down concrete backer and possibly a newer foundation for the countertop. However, when budgetary concerns are an issue(when aren't they) you can look at the countertop and maybe go without the hassle of replacing it prior to tiling. Ours was scratched, a few dings, but nothing that had swollen from moisture. This is good. If you tile over laminate, be sure to scuff it up really good or the adhesive won't bond well. A dremmel tool works v. well for this. Then clean the countertop as well as you can, draw out your lines with a marker and get going. We used a painted wood edging and it doesn't look as good as a designer show home, but it's worlds better than it was.