I think it is more about Demand  and Supply. Currently Politics and Development  is centered around Kathmandu Valley. Demand of land is very high same time scarcity of land. Therefore realestae in Kathmandu valley will not go down unless dramastilay something happen. Similarly reals estate of mid  and western terai has skyrocketen recent years. People of hilly region wants piece of land of terai for various reasons  such as easy acess to transportation, hospital, education etc etc.Many of pahadi nepalese has flown out of eastern terai and have migrated to western terai because of ongoing violence from madhesi people.Nepal's population is growing, income is growing (overseas work) therefore realestate value in nepal will only grow. Therefore guys just buy a land in nepal asap.