What a DRIP is actually doing
A dividend reinvestment plan, or DRIP, uses each cash dividend payment to buy more shares of the same security instead of distributing the cash to the investor. Once that happens, future dividends are paid on a slightly larger share count, which is why reinvestment can create a snowball effect over long holding periods.
That snowball only works when the underlying company or fund continues paying dividends and when the reinvestment cost does not consume too much of the cash flow. A DRIP projection is therefore best understood as a planning model for long-horizon income growth, not as a promise that any one stock will continue paying or increasing dividends indefinitely.