Interface through XI or P2P - How to decide?

We are in the process of implementing XI for a client.
The client currently has about 600 point to point interfaces connecting more than 200 applications to SAP (and to each other).
We are in the process of routing these point-to-point interfaces through XI.
My concern is:
Is there a strategy or guideline to decide which of the existing interfaces should be moved through XI and which of these should continue as point-to-point?
I need inputs from the technical angle as well as the business perspective.
In case I need to pose this question in a business forum too...comments on this will be welcome.
Thanks in advance,
Prasad Kamath

Hey Prasad,
To address few of the queries,
Firstly with cost.
In this case as there are more number of legacy applicaiton and i would assume there is huge amount data being transfered btw legacy and sap the cost involved including licesnse will be on the higher side.
Time lines again depending upon the complexity varies.
If the organization has already implemented sap and want to consolidate upon it in a long term then XI is the best way out. P2P might be the current solution but the complexity of managing such interfaces in a lng term tends to get tedious and higher on the maintenance as you don't have certralized monitoring of such interfaces.
Most important is to have a understanding where sap currently sits in the organizaton in terms of strategy and commitment of the leadership in pushing the drive to leverage on it. At the end of the day now focus has moved from cost ot business benfits.
You cannot avoid BPM in this case.
The customer has some set SLAs which they intend to achieve with XI...for example an end-to-end JCO call takes less than 1 second in the current landscape.....whether we can achieve this from XI...
Abt GRC i suppose the following links will give a insight
www.cio-weblog.com/50226711/sap_goverernace_risk_mgmt_compliance_approach_understanding.php
www.sap.com/belux/solutions/grc/pdf/Solutions_for_GRC_OV.pdf
<b>Cheers,
*RAJ*</b>

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