http://revach.net/article.php?id=4552

Section: Galus & Geula   Category: Eretz Yisroel
Parshas Bichukosai: Bais HaLevi - The Comfort In Eretz Yisroel's Indigestion
"VHashimosi Ani Es HaAretz V'Shamimu Aleha Oiveichema Yoshvim Ba" (Bichukosai 26:32).  Rashi says that it is a great favor for Bnei Yisroel that when we are spit out from Eretz Yisroel and sent into Galus, the land will be desolate and our enemies will not be able to successfully inhabit it.  What difference does it make to us if someone else inhabits Eretz Yisroel in our absence or not?  In fact it may even be beneficial to have someone keep it warm, so that when we return it will not be a wasteland and we will not need to build from scratch.

The Bais HaLevi explains that the reason we are sent out into galus is because Eretz Yisroel is the Makon HaShechina and is an acutely sensitive land.  It is completely Kadosh and cannot tolerate aveiros.  If in our absence it remains desolate and uninhabited by others, it is a sign that its kedusha has not gone away, and Eretz Yisroel will not accept any other sinful nation.  This is testimony to the fact that Eretz Yisroel is still waiting for her struggling sons and daughters who linger in the galus.  She is yearning for us to do Tshuva and return home to the loving embrace of her borders.