Donatello, I will say 2 things here, and both are facts.
1. Pakistani Government is not daft as you are trying to portray. Unless they are able to get a lesser price than the current overall price of gas that lands in Lahore region, they would not purchase from India. So if a deal does get signed, it means that the gas from India was cheaper.
2. GoI is not as daft as you might imagine them to be either. GoI will not build over a 110 km pipeline just for a 'temp measure'. The pipeline costs money to build and 110 plus kms of pipeline does not come cheap. So there will either be a long term contract or built in clause for recovery of money invested by India, in case of early termination of contract.
EDIT: A third point:
The third point is even simpler - gas requirements are obviously all over your country as there are people living all over your country. So what happens in these cases is that geographical proximity is used to transfer resources. So the current gas that is being taken to (say) Lahore from (say) Sui/Balochistan need not be done so. More gas can be provided to areas closer to Sui/Balochistan like KPK, Sindh instead of carting it all the way to Lahore, and Lahore can use gas from India.
Basic economics 101.
1- What you mentioned is exactly what i said. So i am not sure where the difficulty in you understanding that lies.
2-GoI will not build a pipeline unless a long term and FIRM deal is agreed, so yes that is to be seen.
For your third point,
Sui is no longer a major contributor of gas. Most of local gas in Pakistan comes from Sindh/KPK/Punjab. But it is not enough to meet the full requirement, and as reserves dwindle, Pakistan will need gas for short term and long term.
Now what i am trying to repeat here is that Getting gas from India just doesn't make any sense. I am putting the credibility of this news as such posted in the thread in to question, because:
1-There is no mention in Pakistani media. Generally Dawn, The News.com.pk and Express Tribune are pretty good with such news, since it's energy related, however they have not yet mentioned anything, even though they regularly update on the IP/TAPI pipeline and Qatar Gas. Hence i posted the link so you can read. It's only Indian media that's reporting this.
2-Another reason why i question the credibility is that Where will India get the gas from to export to Pakistan? Because India itself is looking to import via TAPI and earlier, via IPI route. So unless India Struck South Pars Gas field near Delhi, i would love to learn more where this gas would come from.
3-Engro Corp of Pakistan is already building the required re-gassification infrastructure in Karachi where imported, LNG tanker borne supplies would be re-gassified and pumped up country, so it's not like India offers a shorter route or something.
4-The price quoted in the news, as posted in this thread, is too expensive. The only reason Qatar deal is delayed is because of pricing formula. Pakistan want cheaper rates than $20 per unit, with price lock that it can't increase for the contract duration.
So yea, unless there is more news to it, A LOT of questions remain to be answered in a technical sense.