[brent13a]

People saw Jesus perform miracles right in front of them and didn't believe.

And?
Did the witnesses who did believe then bow down to those who were healed? Did the wedding party worship the wine that had been changed? I know of nowhere in Tanakh or Jesus' words that tells me I need to worry about physical items nor bow down to them no matter what they are or where they came from.
The act of the miracle itself and the power of that miracle coming from G-d is what should be revered, not the object or byproduct of the miracle.

[Future Snake Eater]

It’s simply a validation of the faith, nothing more. A physical, forensically verifiable item that comes as close to definitive proof as you can get without HD video of the event.

Anyone who worships the Shroud is a fool who needs to go back to the Bible. The Shroud could be burned tomorrow, and it would be a significant historical loss, but it wouldn’t affect Christianity in any way. Not like the effect that destroying Mecca and Medina would have on Islam.