Currently we are using 7 servers for our Magento 1 production site, those are all working under load balancer.  
Now we are planning on Magento 2 upgrade with php7. Because of the php7 and magento 2 better performance compare to php 5.5 and magento 1, 
Is it advisable to reduce the servers to 5? Will we get the same results of the existing system?