Avoiding VLAN bridge with N-IDS?

My understanding is that the deployment of N-IDS in a VLANd environment 
where the switch is spanned to enable a single N-IDS to sniff all VLAN 
traffic creates the risk that the IDS sensor can form a bridge to where 
someone can compromise the N-IDS machine and then use that to sniff all 
traffic or else move from VLAN to VLAN.

Is there information on deploying N-IDS in switched and VLANd environments 
that do not require one N-IDS per VLAN and avoid the above risk if it does 
exist?

Thanks

Chris

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