No, greenhouses are adaptable to many conditions, especially when combined with new technology that facilitates cultivation of non-native plants in unique ecosystems. Soil-free food production that uses much less water than traditional crops is especially well-suited for greenhouse growing, and can also be successfully implemented in buildings that were once used as warehouses or factories, even in basements with the use of artificial grow lights. But that's a whole different discussion. Controlled and moderated environment agriculture represents a new direction in food production, one that can be adapted to diverse and unique climate conditions, crops and food preferences. More work is needed, of course, to perfect greenhouse design and ensure that greenhouse crops are nutritionally equivalent to crops produced by traditional farming methods. The consensus, however, is that greenhouses will continue to be instrumental in food production in the 21st Century and beyond.
The direction that agriculture will move in the future is not yet determined. What is universally agreed upon, though, is that the agricultural methods of the past cannot sustain future population growth, and that newer, more efficient methods are needed. Whether that will mean more greenhouses, or a move toward urban farms and non-traditional methods of growing vegetables and fruits in soil-free urban "farms" is still open for discussion.
