Chemistry ceases to improve when one element is found from which all others are deductible. Physics ceases to progress when one force is found of which all others are manifestations. So religion ceases to progress when unity is reached, which is the case with Hinduism.
Whenever God begins something, we have the assurance that He will finish it. Nothing will stand in the way of Him accomplishing His purpose in this world and in our lives. What God starts, He finishes, and nobody can hinder Him. Sure, delays will happen. Just remember, God is in charge of the delays as well as the progress.
Science has given to this generation the means of unlimited disaster or of unlimited progress. There will remain the greater task of directing knowledge lastingly towards the purpose of peace and human good.
Our words must be judged by our deeds; and in striving for a lofty ideal we must use practical methods; and if we cannot attain all at one leap, we must advance towards it step by step, reasonably content so long as we do actually make some progress in the right direction.