Yes, I agree. There were promises in the Bible for for the return of Christ but I don't believe that the following verses were a promise to return to earth, as I already explained..
John 14:2-3 In my Father's house are many mansions: if it were not so, I would have told you. I go to prepare a place for you. And if I go and prepare a place for you,
I will come again, and receive you unto myself; that where I am, there ye may be also.
Isaiah 11:6-9 The wolf also shall dwell with the lamb, and the leopard shall lie down with the kid; and the calf and the young lion and the fatling together; and a little child shall lead them. And the cow and the bear shall feed; their young ones shall lie down together: and the lion shall eat straw like the ox. And the sucking child shall play on the hole of the asp, and the weaned child shall put his hand on the cockatrice' den.They shall not hurt nor destroy in all my holy mountain: for the earth shall be full of the knowledge of the Lord, as the waters cover the sea.
Those are not prophecies that Baha'ullah was going to fulfill during His lifetime, they are prophecies that refer to what will happen during the next thousand years, during the Dispensation of Baha'u'llah.
Those verses are symbolic, not literal. What those verses mean to a Baha’i is that in the future diverse religions and races will become comrades, friends and companions. The contentions of races, the differences of religions, and the barriers between nations will be completely removed, and all will attain perfect union and reconciliation. Eventually, there will be only one religion, the religion of God.
“My object is none other than the betterment of the world and the tranquillity of its peoples. The well-being of mankind, its peace and security, are unattainable unless and until its unity is firmly established. This unity can never be achieved so long as the counsels which the Pen of the Most High hath revealed are suffered to pass unheeded.”
Gleanings From the Writings of Bahá’u’lláh, p. 286
“The utterance of God is a lamp, whose light is these words: Ye are the fruits of one tree, and the leaves of one branch. Deal ye one with another with the utmost love and harmony, with friendliness and fellowship. He Who is the Day Star of Truth beareth Me witness! So powerful is the light of unity that it can illuminate the whole earth. The one true God, He Who knoweth all things, Himself testifieth to the truth of these words.”
Gleanings From the Writings of Bahá’u’lláh, p. 288