2 ISP's one Cat 5000 switch!

Question,

A company I work for has two ISP's dumping into one switch.

I am trying to track down mysterious problems with servers being failed by the local directors intermittently. The Directors are Cisco LDIR

So with the 2 ISP's and one switch!

I suspect this to be a problem. Am i right are there any drawbacks to this?

Obviously messy. Is this supposed to be avoided?

The rationale is that if either ISP goes down we are OK. However suspect reasoning as now we introduce a single point of failure in the switch.

Any Opinions?

Bud